## Trigonometry (10th Edition)

1. Angle in the Quadrant III, between 180 and 270. It will have negative x and y values. r is always positive. 2. Determine the sign: $\sin\theta=\frac{y}{r}= (-)$ $\cos\theta=\frac{x}{r}= (-)$ $\tan\theta=\frac{y}{x}= (+)$ 3. Remember, the reciprocal trig function will have the same sign as the original function $\csc\theta=(-)$ $\sec\theta=(-)$ $\cot\theta=(+)$